JPS60224575A - Stencil printing method - Google Patents

Abstract

PURPOSE:To increase the amount of an ink and enable to clearly print over the entire region including a composition part and a solid part, by printing by using a specified ink and a specified screen. CONSTITUTION:Printing is conducted by using a W/O emulsion stencil printing ink having a 1min D value (23 deg.C) on a parallel plate viscometer of 35-42 and a screen having a thickness of 185mum, 44 meshes/2.54cm-155mum, 66 meshes/2.54cm. With the thickness of the screen in the above range and the hardness of the ink in the above range, the effect of a printing pressure is produced only on an ink surface layer on the side of a pressure roller, so that it is possible to restrain needless penetration of the ink while maintaining a large amount of the ink on the screen. By stencil printing on a rotary mimeographic press, a required amount of the ink can be uniformly distributed on both the composition part and the solid part, and a clear printed matter can be obtained.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a stencil printing method.

BACKGROUND OF THE INVENTION Due to the recent development and diversification of plate-making machines (electronically perforated fax machine, perforated thermal type using infrared rays, etc.), photographs are present in the image area of printed matter.

The number of pictures and solid areas has increased significantly, and the amount of ink required for each printed sheet has also increased.

In contrast, the value per minute of a conventional parallel plate viscometer is 3 cor 4.
In a rotary mimeograph machine that uses 12th grade ink and a screen of about ioμ, even if a large amount of ink is supplied onto the cylinder, the excess ink is squeezed backwards by the cylinder and printing press roller, and the excess ink is squeezed backwards from the end of the stencil paper. This will result in spillage. Furthermore, text portions of printed matter become indistinct due to ink smearing due to oversupply of ink. Also, as a matter of course, if ink is supplied in an appropriate amount for the text area, ink smudges will occur in photographs, pictures, and solid areas, resulting in cluttered printed matter.

Purpose of the Invention The purpose of the present invention is to increase the amount of ink present on the cylinder from 3 times to more than 10 times compared to the conventional one, and to increase the amount of ink present on the cylinder from text areas to solid areas without causing the above-mentioned problems. K provides a stencil printing method that allows clear printed matter to be obtained.

is 35~41.2 W10 type emulsion stencil ink, thickness igzp, 4I4I mesh/co, Iycm~Is
! The present invention is a stencil printing method characterized by printing using a JIB66 mesh/co, 34IcIn screen.

In the present invention, during stencil printing using a rotary mimeograph machine using a screen, the elongation, spread, or amount of penetration of ink in the screen IJ on the cylinder depends on the composition of the ink, that is, whether the ink is oil-based or not. Is it a W10 emulsion type, or the pressure changes dramatically depending on the ink D value or screen thickness? #I found that I can receive it. It is generally known that in screen printing, as the thickness of the screen increases, the amount of ink that adheres to the printed matter increases, but this is done by rubbing ink with a low viscosity σ) with a squeegee etc. Therefore, in a rotary copying machine for stencil printing, ink with a much higher viscosity than in screen printing is spread onto the upper cylinder by an ink mixing roller, passes through the screen, and is held while being carried to the lower cylinder. Therefore, it is necessary to adjust the viscosity of the ink, the thickness of the screen, and the mesh so as to receive the printing pressure from the suppression roll VC. In other words, it has been found that in order to perform proper printing, it is necessary for K to form an ink layer approximately equal to the thickness of the screen, and for K to be able to exert a viscous influence from the cylinder surface to the outside of the screen due to its thickness. . In other words, even if the screen thickness t is increased to increase the ink retention amount t, if the thickness reaches a point where the ink cannot give viscosity to each other, the ink will no longer spread evenly on the screen and will no longer print. becomes impossible.

According to the results of experiments, emulsion stencil inks with a per minute value (K3C) of 3s to 1 have a screen thickness of 7 mm,
: 120 μm, 341 meshes/piece, 3a size I: 11 degrees, it will not spread evenly and printing will be impossible.

Although it is possible to print with a screen thickness of about θOμ, it is not preferable because the screen creates meshes in the printed matter.

If the ink is less than 1lIt)μ, the excess ink overflows onto the screen and is squeezed out by the press roller, causing the above-mentioned problems. In contrast, Suku IJ-7 Ka1111
1.414t mesh/ko0g4Irm~1sstt.

66 Metsuyu/ko,! Between 4tcr11, the 1 minute value is J! - One emulsion stencil ink holds a large amount of ink depending on its thickness and spreads evenly on the screen. As a result, the necessary amount of ink can be evenly applied to the text portion and the solid portion, and as a result, clear printed matter can be obtained.

That is, in the case of a normal screen of around 100 μm, the influence of the printing pressure by the press roll extends over the entire thickness of the ink layer, whereas in the thickness range of the screen of the present invention and the hardness of the ink, the influence of the printing pressure by the press roll extends over the entire thickness of the ink layer. The printing pressure affects only the different surface layer, so a large amount of ink can be retained on the screen, but it is unique in that it limits the ink from passing through more than necessary.

If the per minute value of the ink is less than 3 tons, it is impossible to limit the amount of ink on the printed material, and if the per minute value exceeds 4 tons, excessive ink will flow out, which is undesirable.

In the case of oil-based inks having equivalent D values, it was not possible to limit the amount of ink due to the difference in "pulling".

Embodiments of the Invention As an example, vinyl fax base paper was made into a plate using HoliFax 1QOt/J-line 6CrN as a JBMS-J64 manuscript based on the test chart established by the Office Machinery Manufacturers Association. In addition, a heat-sensitive base paper made of a polyester film and a support was made using the same manuscript using a Horii Cosmoco 100 plate making machine using Modeda.

Below, each base paper was printed using the Holii Rotary 〇S and the following three types of screens, but in all cases, clear prints from thin letters to solid areas could be obtained.

Thickness cμ) Metsu V-jwm Wire diameter Cμ] Augsita'Cμ) / /11 414I /7? j? Coco/lo! ;0 /A, 2 3417,? /jj
A 0 /j g Koku θ Effects of the Invention According to the method of the present invention, the required amount of ink can be evenly applied to text portions and solid portions by stencil printing using a rotary rotary mimeograph machine using a screen, resulting in clear and sharp images. You can get prints.

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Claims (1)

[Claims] Parallel plate viscometer 1 minute value C j C) is 33 to q W
Thickness ljSμ, l1t with ZO type emulsion stencil ink
l mesh/ko, 3riσ~itsμ, mesh/ko,
, a stencil printing method for printing using a tIIan screen.